Safety valve



April 1o, 192s.

1,665,391 i V. WILLOU GHBY SAFETY VALVE Filed May 22, 1925 2Sheets-Sheet l 'TTONEY 2 Sheets-Sheet v Y za E l vo N0 0 w@ n M a f 6 M#i y a 620i mw awo E r WMF Mw 3 my V. E www 6 a, W a, #www M M,

V. WILLOUGHBY SAFETY VALVE Filed May 22, 1925 April l0, 1928.

' 2 scoe of of the claims will occur to persons 60 which is provided w1Patented Apr. 1o, 192s.

UNITED. STATES VICTOB-WIILOUGHBY, F BIDGEWOOD, NEW JERSEY, ASSIGNOR T-O'AMERICAN' GAB AND FOUNDRY COMI PANY,'0F NEW YORK,

sanary alipucmon mea lay aa,

This invention relates to safetyvalves for car tanks and it is an objectof this 1nvention to provide an improved safety valve having .a sealwhich maintains a as ti ht 5 closure prior to the operation of t e va veand which'is sheared or ruptured by the operation of the valve. It isalso an object of this invention to provide a safety valve of the typedescribed of such construction that l a broken seal may be replacedwithout dismantlin the valve or necessitating the opening of t e valveor the removal ofthe valve from the tank.

The accompanying drawings illustrate the 15 preferred form of theinvention, though it 1s to be understood that the invention is notlimited to the exact details of construction shown and described, as itis obvious that various modifications thereof within the ed inthe art.In said drawings: Fig. 1 is a vertical section of a safety valveconstructed in accordance with this invention 25 and s hown applied to acar tank dome;'

Fig. 2 is a top` plan view of the safetyu valve shown in ig. 1' art ofthe seal retaining rings being bro en away to showother parts moreclearly; A

Fig. `3 is a vertical section drawn to a larger scale taken on the line3-3 of Fig. 2;

Figs. 4, 5 and 6 are views similar to Flg. 3 showing modifiedconstructions of the seal retaining rin s, valve and valve casing;

Fig. 7 is a ottom lan view of the retaing ring of Fig. 6 w ich securesthe seal to the valve casing, and Y c Fig. 8 is a broken transversesection of the ring shown in Fig. 7.

Inhe drawings the safety valve forming the subject matter of thisinvention is shown. applied to a car tank dome 1 having a dome* head 2in which is-the usual openin 3 to receive the safety valve surrounded ythe 45 ring 4 secured to the dome head 2 by rivets (not shown) engagingthe Bange 5 -of the ring 4 and the dome head 2. The'rlng 4 is interiorlythreaded to receive .a valve casing 6 having an inwardly projecting(Bange 8 an inclined valve seat 10 to receive the valve 12 and with asurface 14 which serves asa shoulder against which bears one end of thevalve spring 16. The other end of spring 16 bears against a -ed by theplug 26 threaded in the annular- 'ly from, the outer edge of the surface28, and

lvided at its outer edge with'a downwardly surface 60 above and offset'slightly from the N. Y., A CORPORATION 0E NEWJEBSEY. vALvn. I

itat. semina. sacos.

spider 18 carried by the stem 20 which 'is' pivotally mounted in anopening 22 in the valve 12. The spider 18 is secured in adjustedposition on the `stem 20 by the nuts 24. Leakage through the opening 22is preventflange 27 surrounding the opening 22.

T e valve 12 is provided with a surface 28 inclined to seat on the valveseat 10 and with a surface 30 inclined upwardly and inwardthe Bange 8 isprovided with a horizontal surface 32 extending outwardly from the upperedgev of the surface 10. Secured to the valve 12 by bolts 34 is a ring36 havin a downwardly projecting/Bange 38 provided 70 with an outersurface 37 corresponding in inclination to the surface 30. The ring 36is also (provided with a Bange 40 projecting outwar ly beyond/the Bange38 and pro- 75 projecting Ban e 42, the Ban es 40 and 42 forming with te Bange 38 a s allow` oove 44. Secured to the valve casing 6 y the bolts46 is a ringA 48 having. a Bange 50 provided with a bottom surface 52adapted to bear upon the surface 32 of the valve casing, the Bangeprojecting upwardly and lying beneath the shallow groove 44. Between thesurfaces 30 and 37 and between the surfaces y32 and 52 is a frangibleseal 85 54 securely held in position when the bolts 34 and-.46 aretightened, as the ro'ections of the Banges 38 and 50 are suc t attherings 36 and 48 do not bear against the valve l12 and valve casing 6,respectively, 90

at any points other than these surfaces. As shown in Figs. 1 and 3, thesurfaces 30,

37, 32 and 52 are provided with shallow grooves 56.

In the modification shown in Fig.l 4 the valve-12 is provided with aninclined surface 28 which seats against the valve seat 10 on the Bange 8of the valve casing 6. The valve 12 is provided with a lhorizontalsurface 28 and the Bange 8 is' provided with a horizontal surface 62offset from the valve seat`10. To the valve 12 the bolts 34 secure` aring 36 provided with a downwardly projecting Bange 38 having ahorizontal surface 64' which cooperates with thegsurface 60 of the valveand .with an outwardly projecting Bange 40 having a downwardlyproJecting 46 secure a ring-48 havin a flange 50 with a horizontalbottom sur ace 52 which cooperates wtih theusurface 62'of the valvecas-.

ing flange 8. The flange projects upwardly beneath the shallow groove 44as in the construction shown in- Fig. 3. In this construction as in thecontsruction shown in Fig. 3, the surfaces 60, 64, 52 and 62 areprovided with shallow grooves 56. Secured between the cooperatingsurfaces and 64 and 52 and 62 is av frangible seal 54 held in positionwhen the bolts 34 and 46 are tightened as the. rings 36 and'48 in thisoo nstruction, as in constructionshown in Fig. 3, do not bear againstthe valve 12 or valve casing the seal in position.

In the modified construction shown in Fig. 5', the valve 12 is providedwith the lnclined surface 28 to yengage the valve seat 1 0 o n .theflange 8 of the valve1 casing 6 as 1n prevlous construction. The svalve12 is also provided'with a horizontal surface 60 and has secured theretoby bolts 34 a ring 36 havin a downwardly projecting flange 38 provi edwith an outer surface 64 as in Fig. 4. The'ring 36-is also providedwiththe out-v wardly projecting' yflange- 40 havmg the downwardlyprojecting flange 42 forming with the flange 38 the shallow groove 44 asin the revious constructions. The valve casing ange 8 is provided withan inclined `-surface 70 offset from the surface 10 and extending at anangle thereto and the flange 8 has secured thereto b the bolts 46 a.ring 48 which has an incline surface 72 which co. operates with thesurface 70. The ring 48 is also providedrwith the iange 50 whichprojects upwardly beneath the shallow groove 44. Secured between thesurfaces 60, 64, and 72 is a frangible seal 54 which is held in positionwhen the bolts 34 and .46 are 4tightened as the rings 3 6 and 48 do notcontract with the valve 12 and valve casing 6, respectively, anywhereexcept where in engagement -with the seal 54.

In the Inodied construction shown in Fig. 6, the valve 12 is providedwith the inclined surface 28)which engages the valve seat 10 upontheflange 8 of the valve casing 6 and the valve 121s provided -with a.horizontal 'surface l80 extending at a-n an le from the outervedge ofthe' surface 28. o the valve 12 bolts 34 secure the ring 36 havin adownwardly rojectin flange 38 which as 4an outer surfiice 82 w 'ch'cooperates with the surface on the valve. To the flange so` 38^ issecured the outwardly projecting flange 40 having the downwardlyprojectin ange' 42 which forms with the flange 38 t e shallow groove 44.The valve casing flange 8.

is ,provided with a horizontal up r surface 84 extending from the uppere e of the weasel except at the surfaces which secure' valve seat 10. Tothe valve casing 6 bolts 46 secure a ring 48'havingahorizontal surface.86 which'cooperates with the horizontal surface 84 on the valve casing.Secured between the 'surfaces 80, 82 and 84 and 86 when the bolts 34 and46 are tightened is a frangible seal 54.`

In the construction shown in Fi 6 the ring 48 is shown provided with aange 50 which rojects upwardly beneath the groove 44 an has its outerbottom edge formed into a series of inclined cutting edges88, the lowercorners of which will bear u on the seal 54 and graduall shear the seaas the valve is raised, by t e pressuure in the tank. The inclinedcutting edges ma be appled to the constructions shown in igs. 3 an 4.

In the construction shown in Fig. 5 thel seal is ruptured by the strainput on it without the aid of cutting edges on the retaining rin In caseswhere the shearing action is desired, seals formedl from thin sheets ofiron, brass or lead may be used, while where the rupturing action onlyis desired, seals .of brass, lead or v'rubber may be used.

In the action of this device the valve 12 will be held toits seat by thespring 16 until the pressure in the tank exceeds the pressure for whichthe s ring 16 is setl whereuponv Vthe pressure wi lift the valve causingthe seal to be broken uponthe opening ofthe valve. The opening of thevalve and the breaking of the seal will permit the discharge of theexcess pressure from thetank. Uponthe discharge of the excess pressurefrom the tank, the broken seal may be replaced by lremoving the bolts 34a'nd 46 and removing the rin s 36 and 48, whereupon the re,

48 in position on the sea' 1. In safety valve, a casing having a valveset, a valvefor said seat, a ring carried b ,said valve, a frangibleseal secured to sai valve by said ring and means securiing said seal tosaid casing to prevent release of Huid pressure betweenthe valve and'said valve seat until said seal is broken.

2. .In a safety valve, a casing having an to said surface on said v veby said ring and means securing said seal to said annular valve seatuntil said seal is broken. i

3. In a safety valve, a casing having an inclined valve seat and anannular surface surrounding and extending at an angle t0 said valveseat, a valve havlng a seat engaging. surface yieldingly held to saidvalve seat and a .surface lying above said seat engaging surface andextending at an angle thereto, an annular frangible seal engaging saidlast mentioned surface and the annular surface on said casing, a ringcarried by said valve and having a flange holding said seal in positionon the surface on said valve and a ring secured to said casing andholding said seal in position on said annular surface on said casing,said seal being broken upon movement of said valve vfrom its seat.

4. In a safety valve, a valve casing having an inclined valve seat andan annular surface surrounding said valve seat, a valve havingl asurface yieldingly held in engagement with'4 said valve seat andanannular 4surface at an angle to said seat engaging surface/an annularfrangible seal, a ring carried by said valve having a ange'securing saidsealto said annular surface of said valve and a ring carried by saidcasing having a flange securing said seal to said annular surface ofsaid casing, a flange projecting upwardly from said ring on said casingand an outwardly extending flange `on said ring on said valve overlyingsald upwardly projecting flange on said ring on said casing. l

5. In a safety valve, a'valve casing 'having an annular surface and avalve seat of less diameter than said annular surface, a valve having asurface normally engaging said valve seat and an annular surfaceadjacent to said seatengaging surface, an annular frangible sealoverlying the joint between sald valve and valve seat, a ring detachablysecured to said valve and having a flange securing said seal to sai'dvannular surface on said valve and a ring detachably .secured to4 saidcasing and securing said wardly extending flange forming. a groove withsaid first mentioned fiange and a ring detachably secured to said casingand having said valve.

a flange holding said sealV in engagement with said casing and anupwardly extending flange underlying said groove.

- 7. In a safety valve a casing having a valve seat, a valve yieldinglyheld to said seat, an annular frangible seal overlapping said valve andcasing, said seal being placed on the side of the valve and valve seatnormally free from pressure, and means s ecuring said seal to said valveand casing, sald seal being broken by said valve lupon open-4 ingthereof.d j

8. In a safety valve 'a casing havin va valve seat, a valve yieldinglyheld to said seat, an annular frangible sealoverlappin said valve andcasing on the side thereo normally free from-pressure and means securingsaid 'seal to said valve and casing,

said seal being broken. by said valve uponY opening thereof `of saidvalve and said seal securing means being adapted to permit replacementof said -seal without dismantling 9. In a safety valve, a casing havinga valve seat, a valve for said seatand adapted to be raised from theseat by fluid pressure Ion the bottom thereof, yielding means forholding said valve in contact with said valve seat, a frangiblesealvoutside the surface of engagement of the valve with the valve seat,and. means vfor-securing the frangible seal to the valve and the valveseat to insure` 11. In a safety valve having afcasing, av

valve seat therein, and a valve engaging said seat, said valve and theadjacent portion of the casing having alined surfaces, a frangible sealon said alined surfaces, and retaining 'means on said casing and on saidvalve for normally positioning said frangible seal.

l2. In a safety valve, a casing having a valve seat, a valve for saidseat, a seal retaining element secured to the said casing and positionedadjacent the valve seat, a ring detachably carried by said valve, and afrangible seal positioned across the valve seat and said valve andnormally retained by said seal retaining element and said ring.

13. In a safety valve, a casing having a valve seat, a valve yieldinglyheld to said seat, and a frangible seal secured vto said casing and saidvalve on the side of the valve normally free from pressure,\said sealbeing broken by said v alve upon opening thereof to permit release ofexcess fluid under pres-` sure.

14. In a safety valve, an open e'nded cls` 10. In a safety valve havinga casing, a

ing having a valve seat, a valve ''ieldingly held to .said seat, afranglble'sea overlappin the seat and valve in one open end of saicasing, and easily accessible means for 8 retainingsaid seal in its'overlapped position.

15. In a safety valve, an open ended casing having a valve seat in theupper portionthereof, a valve yieldingly held to lsaid seat,

a frangible seal overlapping the seat and 10 lapped position.

In Witness whereof vI have hereunto set my 15 hand. A

e VICTOR WILLOUGHBY.

